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Negative ion drift and diffusion in a TPC near 1 bar

Martoff, CJ
Ayad, R
Katz-Hyman, M
Bonvicini, G
Schreiner, A
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Journal Article
Date
2005-12-15
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DOI
10.1016/j.nima.2005.08.103
Abstract
Drift velocity and longitudinal diffusion measurements are reported for a Negative Ion TPC (NITPC) operating with Helium+CS2 gas mixtures at total pressures from 160 to 700 torr. Longitudinal diffusion at the thermal-limit was observed for drift fields up to at least 700 V/cm in all gas mixtures tested. The results are of particular interest in connection with mechanical simplification of the DRIFT direction-sensitive Dark Matter search, and for high energy physics experiments in which a low-Z, low density, gaseous tracking detector with no appreciable Lorentz drift is needed for operation in very high magnetic fields. © 2005 Elsevier B.V. All rights reserved.
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Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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